diff --git a/mozilla/content/shared/public/nsLayoutAtoms.h b/mozilla/content/shared/public/nsLayoutAtoms.h
index 075ec6cae77..ad164da609b 100644
--- a/mozilla/content/shared/public/nsLayoutAtoms.h
+++ b/mozilla/content/shared/public/nsLayoutAtoms.h
@@ -58,8 +58,9 @@ public:
   static nsIAtom* floaterList;
 
   // Alphabetical list of pseudo tag names for non-element content
-  static nsIAtom* textTagName;
   static nsIAtom* commentTagName;
+  static nsIAtom* textTagName;
+  static nsIAtom* viewportPseudo;
 };
 
 #endif /* nsLayoutAtoms_h___ */
diff --git a/mozilla/content/shared/src/nsLayoutAtoms.cpp b/mozilla/content/shared/src/nsLayoutAtoms.cpp
index 9b70289774f..2da737bd0db 100644
--- a/mozilla/content/shared/src/nsLayoutAtoms.cpp
+++ b/mozilla/content/shared/src/nsLayoutAtoms.cpp
@@ -43,8 +43,9 @@ nsIAtom* nsLayoutAtoms::colGroupList;
 nsIAtom* nsLayoutAtoms::fixedList;
 nsIAtom* nsLayoutAtoms::floaterList;
 
-nsIAtom* nsLayoutAtoms::textTagName;
 nsIAtom* nsLayoutAtoms::commentTagName;
+nsIAtom* nsLayoutAtoms::textTagName;
+nsIAtom* nsLayoutAtoms::viewportPseudo;
 
 static nsrefcnt gRefCnt;
 
@@ -72,8 +73,9 @@ void nsLayoutAtoms::AddrefAtoms()
     fixedList = NS_NewAtom("Fixed-list");
     floaterList = NS_NewAtom("Floater-list");
 
-    textTagName = NS_NewAtom("__moz_text");
     commentTagName = NS_NewAtom("__moz_comment");
+    textTagName = NS_NewAtom("__moz_text");
+    viewportPseudo = NS_NewAtom(":-MOZ-VIEWPORT");  // XXX lower case
   }
   ++gRefCnt;
 }
@@ -103,8 +105,9 @@ void nsLayoutAtoms::ReleaseAtoms()
     NS_RELEASE(fixedList);
     NS_RELEASE(floaterList);
 
-    NS_RELEASE(textTagName);
     NS_RELEASE(commentTagName);
+    NS_RELEASE(textTagName);
+    NS_RELEASE(viewportPseudo);
   }
 }
 
diff --git a/mozilla/layout/base/nsLayoutAtoms.cpp b/mozilla/layout/base/nsLayoutAtoms.cpp
index 9b70289774f..2da737bd0db 100644
--- a/mozilla/layout/base/nsLayoutAtoms.cpp
+++ b/mozilla/layout/base/nsLayoutAtoms.cpp
@@ -43,8 +43,9 @@ nsIAtom* nsLayoutAtoms::colGroupList;
 nsIAtom* nsLayoutAtoms::fixedList;
 nsIAtom* nsLayoutAtoms::floaterList;
 
-nsIAtom* nsLayoutAtoms::textTagName;
 nsIAtom* nsLayoutAtoms::commentTagName;
+nsIAtom* nsLayoutAtoms::textTagName;
+nsIAtom* nsLayoutAtoms::viewportPseudo;
 
 static nsrefcnt gRefCnt;
 
@@ -72,8 +73,9 @@ void nsLayoutAtoms::AddrefAtoms()
     fixedList = NS_NewAtom("Fixed-list");
     floaterList = NS_NewAtom("Floater-list");
 
-    textTagName = NS_NewAtom("__moz_text");
     commentTagName = NS_NewAtom("__moz_comment");
+    textTagName = NS_NewAtom("__moz_text");
+    viewportPseudo = NS_NewAtom(":-MOZ-VIEWPORT");  // XXX lower case
   }
   ++gRefCnt;
 }
@@ -103,8 +105,9 @@ void nsLayoutAtoms::ReleaseAtoms()
     NS_RELEASE(fixedList);
     NS_RELEASE(floaterList);
 
-    NS_RELEASE(textTagName);
     NS_RELEASE(commentTagName);
+    NS_RELEASE(textTagName);
+    NS_RELEASE(viewportPseudo);
   }
 }
 
diff --git a/mozilla/layout/base/nsLayoutAtoms.h b/mozilla/layout/base/nsLayoutAtoms.h
index 075ec6cae77..ad164da609b 100644
--- a/mozilla/layout/base/nsLayoutAtoms.h
+++ b/mozilla/layout/base/nsLayoutAtoms.h
@@ -58,8 +58,9 @@ public:
   static nsIAtom* floaterList;
 
   // Alphabetical list of pseudo tag names for non-element content
-  static nsIAtom* textTagName;
   static nsIAtom* commentTagName;
+  static nsIAtom* textTagName;
+  static nsIAtom* viewportPseudo;
 };
 
 #endif /* nsLayoutAtoms_h___ */
diff --git a/mozilla/layout/base/public/nsLayoutAtoms.h b/mozilla/layout/base/public/nsLayoutAtoms.h
index 075ec6cae77..ad164da609b 100644
--- a/mozilla/layout/base/public/nsLayoutAtoms.h
+++ b/mozilla/layout/base/public/nsLayoutAtoms.h
@@ -58,8 +58,9 @@ public:
   static nsIAtom* floaterList;
 
   // Alphabetical list of pseudo tag names for non-element content
-  static nsIAtom* textTagName;
   static nsIAtom* commentTagName;
+  static nsIAtom* textTagName;
+  static nsIAtom* viewportPseudo;
 };
 
 #endif /* nsLayoutAtoms_h___ */
diff --git a/mozilla/layout/base/src/nsLayoutAtoms.cpp b/mozilla/layout/base/src/nsLayoutAtoms.cpp
index 9b70289774f..2da737bd0db 100644
--- a/mozilla/layout/base/src/nsLayoutAtoms.cpp
+++ b/mozilla/layout/base/src/nsLayoutAtoms.cpp
@@ -43,8 +43,9 @@ nsIAtom* nsLayoutAtoms::colGroupList;
 nsIAtom* nsLayoutAtoms::fixedList;
 nsIAtom* nsLayoutAtoms::floaterList;
 
-nsIAtom* nsLayoutAtoms::textTagName;
 nsIAtom* nsLayoutAtoms::commentTagName;
+nsIAtom* nsLayoutAtoms::textTagName;
+nsIAtom* nsLayoutAtoms::viewportPseudo;
 
 static nsrefcnt gRefCnt;
 
@@ -72,8 +73,9 @@ void nsLayoutAtoms::AddrefAtoms()
     fixedList = NS_NewAtom("Fixed-list");
     floaterList = NS_NewAtom("Floater-list");
 
-    textTagName = NS_NewAtom("__moz_text");
     commentTagName = NS_NewAtom("__moz_comment");
+    textTagName = NS_NewAtom("__moz_text");
+    viewportPseudo = NS_NewAtom(":-MOZ-VIEWPORT");  // XXX lower case
   }
   ++gRefCnt;
 }
@@ -103,8 +105,9 @@ void nsLayoutAtoms::ReleaseAtoms()
     NS_RELEASE(fixedList);
     NS_RELEASE(floaterList);
 
-    NS_RELEASE(textTagName);
     NS_RELEASE(commentTagName);
+    NS_RELEASE(textTagName);
+    NS_RELEASE(viewportPseudo);
   }
 }